CANADA-The Branch-Plant Economy

September 2, 1972 to him: "Schematically, the Red River delta can be divided into two parts: to the west, in the upper delta, the rivers which tumble directed out of the badly eroded hills have built up several alluvial ridges, along which the rivers flow and which frequently cause changes of course before their waters are brought under control by dykes. To the east, in the lower delta, the rivers, which have deposited most of their alluvial contents further upstream, flow along rather lower natural levees, separated from one another by vast stretcher of very low- lying flat land.